Image Lightbox for WordPress?

I was browsing a blog, when I saw a really interesting WP plugin - http://wordpress.org/extend/plugins/lightbox-2/ - which makes it so when you click on an image it opens in a lightbox. I was wondering if there was any way to do this with WP.com?

I'd love to have the option to include a few javascript snippets to achieve something like this, much like the way you can add widgets to a sidebar/footer area. This way, the people that would love to include a lightbox display or fancy image gallery can do so and those that don't can opt out of loading the code and not have to worry about bandwidth and page load times. Something similar to the way the current shortcodes work. I'm keeping my fingers crossed.